as the earth's interior continued to cool it contracted and the outer crust wrinkled forming rides mountains and basins
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Earth’s outermost, rigid, rocky layer is called the crust. It is composed of low-density, easily melted rocks; the continental crust is predominantly granitic rock (see granite), while composition of the oceanic crust corresponds mainly to that of basalt and gabbro. Analyses of seismic waves, generated by earthquakes within Earth’s interior, show that the crust extends about 50 km (30 miles) beneath the continents but only 5–10 km (3–6 miles) beneath the ocean floors.
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